Melt the white chocolate over a double boiler or in the microwave. Combine it with the heavy cream, sugar, and vanilla sugar, stirring until you have a thick, creamy filling.
On a lightly floured surface, roll out the puff pastry into a thin sheet.
Sprinkle breadcrumbs evenly over the center of the pastry to absorb moisture from the white chocolate filling during baking.
Spread the white chocolate filling evenly over the breadcrumbs, being careful not to let it reach the edges.
Fold the edges of the pastry over the filling, then flip the strudel over so the seam is on the bottom. Brush the top with beaten egg.
Preheat the oven to 350°F (180°C) and bake the strudel for 25-30 minutes, or until golden brown.
Let it cool slightly before slicing. Serve dusted with powdered sugar or grated white chocolate.
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